bark, server: Use checkpoints for lightning receive

Peterrequested to merge
bugfix/forced-exit-blocks-refresh into master
  • check or remove this line after you've added a CHANGELOG entry or if your PR doesn't need one (they should go into CHANGELOG/unreleased/)

Summary by CodeRabbit

  • New Features
    • Lightning-received VTXO claims now use protocol-versioned checkpoints so the server’s watchman stops at the checkpoint rather than force-exiting the freshly claimed leaf.
  • Documentation
    • Updated protocol version documentation and changelog notes to reflect the new Lightning-receive checkpoint behavior and compatibility expectations.
  • Tests
    • Enhanced integration coverage for watchman force-exit, refresh/block progression, and checkpointed Arkoor claim scenarios to verify spendability and correct stopping behavior.
Edited by Peter

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